anterior cingulate gyrus
Acronym: ACgG
The term anterior cingulate gyrus refers to one of three components of the cingulate gyrus of the limbic lobe in the human and the macaque. The others are the posterior cingulate gyrus and the isthmus of the cingulate gyrus ( Carpenter-1983 ). Identified by dissection and internal structure ( Brodmann-1909 ) it is a prominent convolution on the mesial aspect of the cerebral hemisphere.
     In the human it lies dorsal to the anterior two-thirds of the corpus callosum from which it is separated by the callosal sulcus. Rostrally it wraps around the genu of the corpus callosum and becomes continuous with the subcallosal gyrus. In the depth of the callosal sulcus the supracallosal gyrus partially intervenes between it and the corpus callosum. It is not the same as the anterior cingulate cortex, which is defined on the basis of internal structure and function and occupies only the rostral part of the gyrus; the caudal part is midcingulate cortex ( Vogt-2012 ).
     Dorsally the gyrus is separated from the superior frontal gyrus by the cingulate sulcus. It is bounded caudally by the posterior cingulate gyrus. The junction, which is unmarked topologically, is located at about the level of the central sulcus on the dorsal surface of the hemisphere. It corresponds to the boundary between cytoarchitectural area 24 (anterior) and area 23 (posterior) ( Vogt-2012 ).
     In the macaque the gyrus occupies only the anterior half of the area dorsal to the corpus callosum and includes the area topologically equivalent to the subcallosal gyrus of the human. It is bounded rostrally by the straight gyrus from which it is partially separated by the rostral sulcus ( Martin-2000 ). Except for greater complexity of sulcal patterns in the human ( Vogt-1995 ), it is similar in the macaque ( Vogt-1987 ).
     While the rat and mouse share structures equivalent by internal structure to parts of anterior cingulate cortex in primates, a topological equivalent to the gyrus is not found in the smooth cerebral cortex of the rat or mouse.

Also known as: anterior cingulate, Gyrus cinguli anteriorNeuroNames ID : 161

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